package com.atguigu.gulimall.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

//    @Autowired
//    CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> getListWithTree() {
        //1、查出所有分类
        List<CategoryEntity> entityList = baseMapper.selectList(null);

        //2、组装成父子结构
        //2.1)先找到所有的一级分类
        List<CategoryEntity> level1Menus = entityList.stream().filter(categoryEntity ->
            categoryEntity.getParentCid() == 0
        ).map((menu)->{
            //为每一个菜单找到子菜单setChildren(),这个属性是之前加在entity里面的
            menu.setChildren(getChildren(menu,entityList));
            return menu;
        }).sorted((menu1,menu2)-> {
            return (menu1.getSort() == null? 0:menu1.getSort()) - (menu2.getSort() ==null? 0:menu2.getSort());
        }).collect(Collectors.toList());

        return level1Menus;
    }

    @Override
    public void removeMenuBuIds(List<Long> asList) {
        //TODO 检查当前菜单是否被别的地方引用

        //逻辑删除 加上逻辑删除注解@TableLogic
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public void updateCascade(CategoryEntity category) {
        baseMapper.updateById(category);
    }

    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildren(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            //1.找到子菜单
            categoryEntity.setChildren(getChildren(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            return (menu1.getSort() == null? 0:menu1.getSort()) - (menu2.getSort() ==null? 0:menu2.getSort());
        }).collect(Collectors.toList());

        return children;
    }

}